Hinge-pin for breech-loading guns.



PATENTED JUNE 30, 1908.

" -N. J. A. FYRBERG.

HINGE PIN FOR BRBBGH LOADING GUNS.

APPLIGATION FILED JULY 24, l 907.

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NILS J. A. FYRBERG, OF 'HOPKINTON, MASSACHUSETTS.

HINGE-PIN FOB BREECI-LLOADING GUNS.

Specification of Letters Patent.

Patented. June 30, 1908.

Application filed July 24-, 1907. Serial No. 385,259.

To all whom it may concern:

Be it known that I, NILs J. A. FYRBERG, a citizen of the United States, residing at Hopkinton, in the county of Middlesex and State of Massachusetts, have inventeda new and useful Hinge-Pin for Breech-Loading Guns, of which the following is a specification.

This invention relates to a hinge pin for use in looking the fore-end of a breech loading fire-arm to the frame.

The principal objects of the invention are to ing pin may be operated by being turned a short distance, as for example, a quarter turn in either direction to securely lo ck it in place 1 to provide means whereby the oint at which the pin is positively locked wil be on the opposite side of the frame from that at which the fixed head of the pin is located so as to secure a stronger construction and a more convenient and cheaper in to make; to provide means for normal y holding fiat the movable part of the head. which I call the operating piece, with such force that it will no the accident ally turned outwardly but may removable from the easily be brought into operative position when desired; to provide a construction in which the'hinge pin may easily and quickly be removed and parts dismounted while the fore-end and barrel are fixed together; and generally to simplify and improve the construction of a hinge pin of this character.

Reference is to be had to the accompanying drawings which illustrate a preferred form of the invention and in which,

Figure 1 is a side elevation of a breech loading fire-arm with the invention applied thereto. Fig. 2 is a sectional view of the same through the center of the hinge pin when the fire-arm is closed. Fig. 3 is a sectional view on the line 3-3 of Fig. 2. Fig. 4

is a side elevation of the pin itself with parts in section, and Fig. 5 is a side elevation at right-angles to Fig. 4.

The barrel 10 of the gun is mounted as usual on the fore-end 11 and as far as this invention is concerned, these parts may be permanently secured together as they do not have to be disconnected for the operation of separating the fore-end and frame 12, although in practice, the {ore-end is usually arre.

The frame fits the fore-end in the usual way and has side walls 13 and 14 as is well understood in the art. It is also provided provide a construction in which the lock-' with a passage 15 which extends through both of these walls, this passage preferably being cylindrical or slightly conical desired. The frame is also rovided with-a counter-sunk o ening 16 w iich in general is circular or cy lndrical in form but which preferably has an extension 17. This opening with its extension is preferably located entirely within the surface of this wall'of the frame. The other wall 14 is provided with a pin 18 extending into the passage therethrough. This pin is fixed in position but 1s in reality a locking pin for look ng a hinge pin 20 in position. This hinge pin is of such shape and size as to fit the passage 15 and 1t is provided with a circumferential groove 21 in which the pin 18 is adapted to engage. In order to provide for allowing the pin 18 to enter this groove,- a slot 22 extends therefrom to the end of the pin. end. of the pin is a permanently fixed and preferably integral head 23 which is preferably semi cylindrical or conlcal in shape so that it may be turned completely around if desired in the counter sunk opening 16. This preferably constitutes slightly more than half ating plate 24 which completes the circle and projects out into the extension 13 so as to furnish suflicient leverage for the operation which will be described.

The parts 23 and 24 are designed to be held in their flat position; that is, that in dicated in Figs. 1, 2 and 3, by means of a pin 25 pressed outwardly by a spring 26 to engage in a cavity 27. The pin is shown as being mounted in a plate 24 and the cavity in a head 23 but this order may obviously be reversed if desired.

The pin is provided with a slanting or rounded surface so that when the operating plate is flat down, it may be forced. upwardly by the application of pressure, the rounded or slanting surface of the pin causing the same to yield as will be readily understood. When the operating plate is turned. up to the position shown in Figs. 4;, and. 5, it is in convenient place for operating to turn the pin. so as to bring the slot 22 into registration with the locking pin 18 so that the hinge pin may be withdrawn or inserted as may be desired.

The operating plate may be connected with the permanent headin any desired way but preferably it'has a projection, 270 which. extends into a slot 28 in the head. and is pivoted thereto. by means of a pin, 29 extend- On the other ing through said projection. The pointvat which this pin is applied is substantially in' It will be seen that this invention provides for causing the locking action to take place on the side opposite the head of the hinge pin so' that a stronger construction is provided and so' that the groove in thepin may be more easily located at a distance from the fixed head thereof. Moreover, as the groove extends entirely around the. pin, the same may be turned freely in either direction to bring it into positionfor insertion or removal.

While I have illustrated and described a preferred form of the invention, I am aware that many modifications may-be made therein by any person skilled in the. art without departing from the scope of the invention as expressed inthe claims. Therefore, I .do' not wish to be limited to the particular form shown, but v What I do claim is 1. In a breech loading fire-arm, the combination witha frame having a passage therein,

an enlarged counter-sunk opening'on one side of the frame at one end of said passage, and a pin projecting into' said passage from. its wall on the opposite side of said frame, of a hinge pin having a movable head on one end fitting in said opening, and a circumferential square-shouldered groove near the other end 1n whlch said pin engages for positively lock' ing the hinge pin to the frame, said groove having a slot extending therefrom to-the end of the hinge pin whereby said hinge'pin may beturned to bring the fixed pin into the slot so that the hinge pin may be removed.

2. In a breechloading fire-arm, the eombination with a frame having two side walls, a passage extending through the two walls of said frame, a counter-sunk opening in the outer surface of one wall communicating with said passage and having an outward extension, said opening and extension being located entirely within the surface" of sa d frame, and an opening in the other-of sa d walls and a pin therein projecting into said passage, of a hinge pin fitting said passage having a circumferential groovefor receiving said pin in the frame, and a slot from said groove to the end of the pin, and a movable head on the pin adapted to engage in said opening and extension thereof and to 'be located entirely within the flat surfa'ceof said frame.

3; A hinge pin for fire-arms comprising a "body having a circumferentiallocking'groove near one end, a slot extending from said groove to the end of the pin and a fixed head at the other end, an operating piece pivotally f' connected with said. fixed head and adapted to be moved. into the plane thereof perpendi-cular to the axis of thepin, and means for yieldingly holding the operating piece in position in the plane of the head.

In testimony whereof I have hereunto set j my hand, in the presence of two subscribing witnesses.

I NILS J. A.-FYRBERG.

Witnesses:

FRED A. VVooD, Wnns'rnn W. PAGE. 

